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Is there any performance difference between using RTK on COM2 (RS422) or COM4 (RS232)?

Is there any performance difference between using RTK on COM2 (RS422) or COM4 (RS232)?

No difference. Both ports send out a $GPGGA message at 1 Hz – and the message is sent on to the RTK network – and then an RTCM3 message is received back through the port.